Dental unit



FIG. 1 is a perspective view,

FIG. 2 is a front face view,

FIG. 3 is a rear face view,

FIG. 4 is a right-hand side view,

FIG. 5 is a left-hand side view,

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for dental unit, as shown and described. 